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50G-PON,anewgenerationofPONtechnologyafter10GPON

ReviewofPONtechnologydevelopment

PONtechnologyisabroadbandaccesstechnologybasedonpassiveODNnetwork.Itadoptsp2mppointtomultipointtopology,independentuplinkanddownlinktransmissionwavelengths,andtimepisionmultiplexingofdata.TheODNnetworkconnectingOLTandONUinPONsystemadoptspureopticalmedium,whichispassiveinthewholeprocess,hasstrongenvironmentaladaptability,andiseasytoexpandandupgrade.Inthepast10years,PONtechnologyhasachievedgreatsuccessandbeendeployedonalargescaleduetoitscomparativeadvantagesovercopperwireaccessintermsofopticalfiber,passiveandp2mp.InthedevelopmentofPONtechnology,standardsorganizationsITU-T/FSANandIEEEhaveplayedagreatroleinpromotingit.PONtechnologyoriginatedfromtheearlyAPON/BPON.Afterseveralgenerationsofdevelopment,GPONandEPONhavebeencommerciallydeployedonalargescale,providinguserswithbandwidthaccesscapacityofupto100megabytes.Itsnextgeneration10G

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PONtechnologiessuchas10GGPONand10G-EPONhavealsobeencommercializedonalargescale,whichcanprovideuserswithupto1Gbpsbandwidth,realizegigabitnetworkcoverage,meetthelarge-scaleapplicationsof4K/8KvideoservicesandtheearlyimportrequirementsofVR/ARservices.WithvideoservicebecomingthebasicserviceofbroadbandnetworkandPONtechnologygraduallyexpandingfromhomewidefieldtogovernmententerpriseindustry,suchastelemedicine,industrialintelligentmanufacturing,factoryandminecommunication,ontheonehand,itputsforwardhigherrequirementsforbandwidth,ontheotherhand,italsoputsforwardcorrespondingrequirementsfordelay,packetloss,jitter,servicequalityanduserexperience.Forexample,thebandwidthofVRserviceisrequiredtoexceed1Gbps,theuserexperienceimprovementneeds5ms(RTTdelay)lowdelay,whiletheend-to-endcommunicationdelayoftelemedicineislessthan50msandthejitterislessthan200μs。Inordertomeettheneedsofbusinessdevelopmentinthepost10GPONera,IEEEandITU-T/FSANbegantoconsiderthetechnicalresearchofthenextgenerationPONaftercompletingthestandardformulationof10GPON.

MainstreamtechnologydirectionofnextgenerationPON:50G-PON

Itisgenerallyrecognizedintheindustrytoincreasethebandwidthofthenextgenerationopticalaccessnetworkto50Gbps.Therefore,howtoupgradethesystembandwidthsimplyandefficientlyhasbecomearesearchhotspotinthefieldofPON.ThedevelopmenttrendofthenextgenerationPONtechnologyafter10GPONmainlyhastwodirections:oneistoimprovethesinglewavelengthrate;Second,multiwavelengthmultiplexingimprovesthetotalrate.IEEEtooktheleadinlaunchingthestandardformulationofthenextgenerationPONtechnologyafter10GPON.Itsupports25Gbpsdownlinkrate,10Gbps/25Gbpsuplinkrateandcompatibilitywith10G-EPONonasingleopticalfiber.For50Gbpsbandwidthrequirements,multiwavelengthSuperpositionTechnologyandchannelbindingtechnologyareusedtoprovidetwo25Gbpschannelstoachieve50Gbpsrate.ITU-T/FSANconsidersthescenariosofhomeusers,enterpriseusersandMobileBackhaul/forwardtransmission,andgraduallyformsthedemandforthenextgenerationPON,focusingonthe50G-PON

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technologywithasinglechannelrateof50Gbps.In2018,ITU-T/FSANlaunchedthestandardformulationbasedonsinglewavelength50G-PON,named"g.HSP(G.higherspeedPON)",whichisexpectedtohavecommercialcapacityin2025.Beforethistimepoint,10GPONwillbedeployedasthemainstreamopticalaccesstechnologyintheindustryonalargescale.

Therequirementsof50G-PONincludeprovidingmorethan4timestheaccessbandwidth,betterservicesupportcapability,networkprotection/security,supportingthecoexistenceandsmoothevolutionof10GPON,andbeingcompatiblewiththeexistingODNnetworkasmuchaspossible.Theuplinkanddownlinkwavelengthsof50G-PONworkintheo-bandanddonotsupportcoexistencewithGPONand10GGPONatthesametime.FECselectsLDPCerrorcorrectionalgorithm.Inordertobettersupportlowdelay,50G-PONtechnologyintroducestechnologiessuchasdedicatedactivationwavelength(Daw)andcodba(cooperativeDBA).UsingDawtechnology,ONUisregisteredandactivatedthroughspecialwavelength,andtheservicewavelengthisnolongerallocatedwithsilentwindow,whichcanreducethetransmissiondelaycausedbyregistrationwindow.Usingcodbatechnology,datacanbeforwardeddirectlywithoutwaiting,whichcanreducethedelaycausedbybandwidthscheduling.

Evolutionandcoexistenceof10GGPONtechnologyto50G-PON

Inthenetworkevolution,operatorshavealwaysfocusedonmakingfulluseofexistingnetworkresourcesandsavingupgradeandevolutioncosts.Inordertorealizethesmoothevolutionfrom10gGPONto50G-PONandmeetthenetworkingrequirementsofdifferentservices,10GGPONand50G-PONwillcoexistwithinacertainperiodoftime.Thefirstmockexamhasbeenverifiedtobethemosteffectivemeanstosavethecomputerroomdeployment,reducetheenergyconsumptionofopticalaccessdevices,effectivelyutilizetheODNresourcesoftheexistingnetworkandreducethecostofnetworkconstructionofoperators.Therefore,intheprocessof50G-PONdevelopment,thetwostepmigrationmodecanbeconsidered.Firstly,itevolvesfromGPONto10GGPON,andthenevolvesfrom10G

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GPONto50G-PON.Itrealizesthecontinuousupgradingofbandwidthwhiletakingintoaccountthenetworkevolutionandcost.Theindustryiscommittedtopromotingthestandardizationof50G-PONtechnology.Atthesametime,somecontentsanddirectionsneedtobefurtherstudied,suchastheexclusivebandwidthrequirementstosupportmultipleoperatorsorservicesinthefuture,aswellasthedelayrequirements,performanceandcostintroducedtosolvethetightuplinkopticalpowerbudgetof50G-PON.Fromthecurrentprogress,itisexpectedthat50G-PONwillhavecommercialdeploymentcapabilityaround2025,and10GPONtechnologywillbedeployedonalargescalebeforethistimepoint,layingasolidfoundationforthesubsequentsmoothevolutionto50G-PON.

XYThasbeencommittedtopromotingthestandardizationof50

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G-PONandthecontinuousimprovementoftheindustrialchain.IthasmanysuccessfulcasesinPONtransmission.ItsownproductsalsocoverallpartsfromOLTtoONUequipment.Customersathomeandabroadarewelcometonegotiateandcooperate.

LinktotheofficialwebsiteofXYT:xyt-tech/cn/

PONtransmissiondevicelink:xyt-tech/cn/prolists/815.html